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| Item | Specification |
|---|---|
| Product Model | Example: S11-M-500/10, S13-R-1000/20, S15-H-2500/35 (S=Three-Phase; 11/13/15=Efficiency Class; M/R/H=Structural Type; Capacity kVA/HV kV) |
| Rated Capacity (Sn) | 30kVA~5000kVA (ONAN: 100% rated capacity; ODAF: 130%; ODWF: 160%) |
| Phase/Frequency | Three-Phase (standard); 50Hz/60Hz (±1% tolerance, customizable for 400Hz special use) |
| Connection Group | Dyn11 (default for distribution), Yd11 (for power transformer); Yyn0 (optional) |
| Cooling Type | ONAN (Oil Natural Air Natural) / ODAF (Oil Directed Air Forced) / ODWF (Oil Directed Water Forced) |
| Condition | Detail |
|---|---|
| Ambient Temperature | -25℃~40℃ (standard); -40℃~45℃ (low-temperature/high-temperature models with modified oil). |
| Altitude | ≤1000m (derate 5% at 1500m, 10% at 3000m, 15% at 4000m). |
| Humidity | ≤90% @25℃ (no condensation); ≤50% @40℃. |
| Seismic Resistance | GB 50260-2013 / IEC 60076-11, 7-degree intensity (0.15g acceleration); 8-degree optional. |
| Protection Class | IP23 (outdoor, dust/rainproof) / IP20 (indoor). |
| Efficiency Class | Parameter | 500kVA/10kV Example | Test Condition |
|---|---|---|---|
| S11 (IEC IE1) | No-Load Loss (Po) | ≤810W | Rated voltage/frequency |
| Load Loss (Pk) | ≤5200W | Rated current, 75℃ | |
| S13 (IEC IE2) | No-Load Loss (Po) | ≤650W (20% lower than S11) | Rated voltage/frequency |
| Load Loss (Pk) | ≤4800W | Rated current, 75℃ | |
| S15 (IEC IE3) | No-Load Loss (Po) | ≤520W (36% lower than S11) | Rated voltage/frequency |
| Load Loss (Pk) | ≤4500W | Rated current, 75℃ | |
| All Classes | Short-Circuit Impedance (Uk%) | 4%~6% (10kV class); 6%~8% (35kV class) | 75℃, ±10% tolerance |
| No-Load Current (Io%) | ≤1.0% (30~250kVA); ≤0.6% (≥315kVA) | Rated voltage |
Efficiency Compliance: GB 20052-2024 Class 2 (S11/S13) / Class 1 (S15); IEC 60076-11 IE1/IE2/IE3
| Item | Value |
|---|---|
| Rated Capacity | 500kVA |
| HV/LV Voltage/Current | 10kV/28.87A; 0.4kV/721.7A |
| No-Load/Load Loss | ≤650W / ≤4800W |
| Short-Circuit Impedance | 4.5% |
| Cooling Method | ONAN |
| Core Material | 30Q130 Silicon Steel |
| Protection Class | IP23 |
Customizable for special voltages (e.g., 6.3kV, 13.8kV), high-altitude (≥3000m), or explosion-proof (Ex d IIB T4) requirements. All parameters verified by SGS/Intertek.
Leveraging the high thermal conductivity of insulating oil, the transformer efficiently transfers heat generated by internal coils and cores to the tank (and external radiators). This enables stable operation even under high load or long continuous working conditions, preventing overheating-induced component damage and ensuring consistent power output.
Insulating oil not only dissipates heat but also enhances electrical insulation between internal parts (e.g., coils, iron cores). It effectively isolates air, moisture, and dust, reducing the risk of leakage or short circuits. This advantage makes the transformer highly reliable in humid, dusty, or harsh industrial environments.
The oil-immersed structure and optimized heat dissipation allow the transformer to withstand short-term overloads (e.g., sudden power surges in industrial production or peak civilian electricity use). Its ability to absorb and dissipate excess heat quickly minimizes performance degradation, avoiding unexpected shutdowns.
The sealed oil tank protects internal components from external corrosion, dust, and mechanical wear. Additionally, high-quality insulating oil maintains stable performance over time, slowing the aging of coils and insulation materials. The transformer’s design life typically exceeds 20 years, reducing the frequency of equipment replacement.
The sealed structure reduces exposure to external contaminants, lowering the need for frequent internal cleaning or part replacement. Routine maintenance only involves periodic checks of oil level, oil quality, and tank tightness—simplifying operations and cutting long-term maintenance costs.
Due to its excellent insulation and heat dissipation, the Oil-Immersed Transformer is widely used in high-voltage power grids, large industrial plants, and infrastructure projects (e.g., power transmission between substations). It meets strict voltage resistance standards, ensuring safe and efficient high-power transmission.
They offer excellent heat dissipation, superior insulation in harsh conditions, high overload capacity, low maintenance demands, and an extensive operational lifespan typically exceeding 20 years.
These classifications represent energy efficiency standards. For example, the S13 model exhibits 20% lower no-load loss than the S11, while the S15 model reduces no-load loss by 36% compared to the S11, delivering optimized energy conservation.
Transformers can be customized to support unique voltages (e.g., 6.3kV, 13.8kV), extreme high-altitudes (≥3000m), explosion-proof structural designs (Ex d IIB T4), and specialized cooling systems based on environmental factors.
Standard operation is rated up to 1000m in altitude. Above this level, the capacity must be derated by 5% at 1500m, 10% at 3000m, and 15% at 4000m to preserve electrical reliability.
Due to their fully sealed construction which blocks external pollutants, maintenance is minimal. It typically requires only regular checks on the oil level, oil quality, and the overall seal integrity of the tank.
They are fully compliant with major international standards including GB 20052-2024 (Class 1 & 2), IEC 60076-11 (IE1/IE2/IE3), and GB 50260-2013, with performance specifications verified by SGS and Intertek.
